$column() {
    display: box;
    display: -webkit-box;
    display: -moz-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    flex-direction: column;
}
$flex-1(){
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
}
$row(){
    display: box;
    display: -webkit-box;
    display: -moz-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
}
$flex-vc() {
    /* 12版 */
    -webkit-justify-content: center;
       -moz-justify-content: center;
        -ms-justify-content: center;
         -o-justify-content: center;
            justify-content: center;
}
$flex-sb() {
    /* 12版 */
    -webkit-justify-content: space-between;
       -moz-justify-content: space-between;
        -ms-justify-content: space-between;
         -o-justify-content: space-between;
            justify-content: space-between;
}
$flex-sa() {
    /* 12版 */
    -webkit-justify-content: space-around;
       -moz-justify-content: space-around;
        -ms-justify-content: space-around;
         -o-justify-content: space-around;
            justify-content: space-around;
}
$flex-top() {
    /* 12版 */
    -webkit-justify-content: flex-start;
       -moz-justify-content: flex-start;
        -ms-justify-content: flex-start;
         -o-justify-content: flex-start;
            justify-content: flex-start;
}
$flex-end() {
    /* 12版 */
    -webkit-justify-content: flex-end;
       -moz-justify-content: flex-end;
        -ms-justify-content: flex-end;
         -o-justify-content: flex-end;
            justify-content: flex-end;
}
$flex-ac() {
    -webkit-align-items: center;
       -moz-align-items: center;
        -ms-align-items: center;
         -o-align-items: center;
            align-items: center;
}
$flex-ai-top() {
    -webkit-align-items: flex-start;
       -moz-align-items: flex-start;
        -ms-align-items: flex-start;
         -o-align-items: flex-start;
            align-items: flex-start;
}
.column {
    $column()
}
.row-vc {
    $row()
    $flex-vc()
}